Speaking of which, A square 10, I notice what appears to be a screw hole for the barrel securing screw in the bottom of your stock just behind the band. My MkI forearm has that screw under the band. Did they alter the position of that screw on some MkI stocks as your stock doesn't appear to be a MkIII stock, Ray
Looks like a MkIII forend as there doesn't appear to be a outer band retaining pin fitted though the forend in front of band, this was omitted from production late 1909.
Here's one fitted to a 1907 MkIII forend.